Building work in Chiswick: area guide

This is our area guide to building work in Chiswick (W4, Hounslow): the housing, the council rules that apply (Hounslow Council for planning) and every service we offer here. For whole-house refurbishment go to Home renovation in Chiswick.

Look along a Chiswick roofline from Turnham Green and not every roof is a simple pitch. Behind the parapets of some of the older W4 terraces sit butterfly roofs, two slopes falling inwards to a central valley gutter that carries water the length of the house before discharging at the back. Where a house has one, that single detail explains many of the leaks we are called to, and it changes what a top floor bathroom renovation involves. Most W4 homes are now flats, and much of the older stock sits in Hounslow Council conservation areas such as Strand on the Green and Old Chiswick, so check the designation before any outside work is drawn. GS Renovation works across the postcode on structural work, extensions and interiors, coordinating Hounslow Council building control.

Chiswick has around 16,410 homes on the Council Tax list: 34% post-war, 15% interwar and 51% predate 1919, with 59% flats and 41% houses. VOA Council Tax stock of properties, March 2025, for Chiswick North East, Chiswick South East, Chiswick South West and Chiswick Park. Counts rounded by the VOA.

W4 lower ground floors: drains and vaults before the kitchen

Some of the taller early terraces in W4 include a basement level opening onto a front lightwell, and a few have vaults reaching out under the pavement. Using that level is entirely achievable, but a kitchen renovation down there starts with the condition of the vault and the drainage, not the layout. Old salt glazed drains, a lightwell gully that overflows in heavy rain and brickwork softened by decades of standing water are all common, and all are dealt with before finishes go in. Old drainage is tested before a new floor is laid over it.

Where more headroom is wanted, lowering a floor is structural alteration work, not a matter of digging out a bit at a time. Existing foundations may need underpinning in designed sequence, and the retaining condition against the street has to be considered. The engineer we appoint produces that design and we build to it in bays, with building control inspecting as the sequence progresses. Where excavation comes near a shared boundary, you serve party wall notice as building owner before it begins. Excavating a lower ground floor without that design is how a front elevation ends up moving.

Where to go next for work in Chiswick: house extensions in Chiswick, the Hounslow area guide, building work in Acton, building work in Hammersmith and How to Choose a Builder.